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Fiber Cable Assemblies.

100G QSFP28 SR4

The 100G-QSFP28-SR4 is a Four-Channel, Pluggable, Parallel, Fiber-Optic QSFP28 Transceiver for IEEE 802.3bm, 100GBASE SR4 Applications,or 40 Gigabit Ethernet and Infiniband FDR/EDR Applications. The QSFP28 full-duplex optical module offers 4 independent transmit and receive channels, each capable of 26Gbps operation for an aggregate data rate of 104Gbps 70m using OM3 fiber. These 100G-QSFP28-SR4 are designed to operate over multimode fiber systems using 850nm VCSEL laser array. An 11 optical fiber ribbon cable with an MPO/MTPTM connector can be plugged into the QSFP module receptacle. QSFP28 SR4 is one kind of parallel transceiver which provides increased port density and total system cost savings.

100G-QSFP28-SR4 Features
Four-channel full-duplex transceiver modules
Transmission data rate up to 26Gbit/s per channel
Up to 70m on OM3 Multimode Fiber (MMF)and 100m on OM4 MMF
Low power consumption <3.5W
Operating case temperature 0°C to +70°C
3.3V power supply voltage
RoHS 6 compliant
Hot Pluggable QSFP form factor
MPO connector receptacle
Built-in digital diagnostic function

100G-QSFP28-SR4 Applications
IEEE 802.3bm 100GBASE SR4 and 40GBASE SR4
Proprietary High Speed Interconnections
Data center

Absolute Maximum Ratings
The operation in excess of any absolute maximum ratings might cause permanent damage to this module.

Parameter Symbol Min Max Unit Note
Storage Temperature TST -40 85 degC
Relative Humidity(non-condensing) RH 0 85 %
Operating Case Temperature TOPC 0 70 degC
Supply Voltage VCC -0.3 3.6 V
Input Voltage Vin -0.3 Vcc+0.3 V

Recommended Operating Conditions and Supply Requirements

Parameter Symbol Min Typical Max Unit
Operating Case Temperature TOPC 0 70 degC
Power Supply Voltage VCC 3.13 3.3 3.47 V
Power Consumption 3.5 W
Data Rate DR 25.78125 Gbps
Data Speed Tolerance ∆DR -100 +100 ppm
Link Distance with OM3 fiber D 0 70 m

Optical Characteristics
All parameters are specified under the recommended operating conditions with PRBS31 data pattern unless otherwise specified.

Parameter Symbol Min Typical Max Unit Notes
Center Wavelength λC 840 850 860 nm 1
RMS Spectral Width λrms 0.65 nm 1
Average Launch Power, each lane PAVG -7 -2.5 0 dBm
Optical Modulation Amplitude POMA -5 -2.5 0 dBm 1


Difference in Launch Power between any two lanes Ptx,diff 4.0 dB
Launch Power in OMA minus

Transmitter and Dispersion

Penalty (TDP), each Lane

OMA-TDP 3.5 dB 1
Extinction Ratio ER 3.5 dB
Transmitter Eye Mask Margin EMM 10 % 2
Average Launch Power OFF

Transmitter, each Lane

Poff -30 dBm
Transmitter Eye Mask

Definition {X1, X2, X3, Y1, Y2,


{0.3, 0.38, 0.45, 0.35, 0.41, 0.5}
Parameter Symbol Min Typical Max Unit Notes
Center Wavelength λC 840 850 860 nm
Damage Threshold THd +3 dBm
Overload, each lane OVL +2.4 dBm
Receiver Sensitivity in OMA, each Lane SEN -10.3 dBm
Signal Loss Assert Threshold LOSA -30 dBm
Signal Loss Deassert Threshold LOSD -9 dBm
LOS Hysteresis LOSH 0.5 6 dB
Optical Return Loss ORL -12 dBm


  1. Transmitter wavelength, RMS spectral width and power need to meet the OMA minus TDP specs to guarantee link performance.
  2. The eye diagram is tested with 1000 waveform.

Electrical Specifications

Parameter Symbol Min Typical Max Unit
Differential input impedance Zin 90 100 110 ohm


Differential Output impedance Zout 90 100 110 ohm
Differential input voltage amplitude ΔVin 300 1100 mVp-p
Differential output voltage amplitude ΔVout 500 800 mVp-p
Bit Error Rate BR E-12
Input Logic Level High VIH 2.0 VCC V
Input Logic Level Low VIL 0 0.8 V
Output Logic Level High VOH VCC-0.5 VCC V
Output Logic Level Low VOL 0 0.4 V

Pin Descriptions

PIN Logic Symbol Name/Description Note
1 GND Ground 1
2 CML-I Tx2n Transmitter Inverted Data Input
3 CML-I Tx2p Transmitter Non-Inverted Data output
4 GND Ground 1
5 CML-I Tx4n Transmitter Inverted Data Input
6 CML-I Tx4p Transmitter Non-Inverted Data output
7 GND Ground 1
8 LVTLL-I ModSelL Module Select
9 LVTLL-I ResetL Module Reset
10 VccRx ﹢3.3V Power Supply Receiver 2
11 LVCMOS-I/O SCL 2-Wire Serial Interface Clock
12 LVCMOS-I/O SDA 2-Wire Serial Interface Data
13 GND Ground
14 CML-O Rx3p Receiver Non-Inverted Data Output
15 CML-O Rx3n Receiver Inverted Data Output
16 GND Ground 1
17 CML-O Rx1p Receiver Non-Inverted Data Output
18 CML-O Rx1n Receiver Inverted Data Output
19 GND Ground 1
20 GND Ground 1
21 CML-O Rx2n Receiver Inverted Data Output
22 CML-O Rx2p Receiver Non-Inverted Data Output
23 GND Ground 1
24 CML-O Rx4n Receiver Inverted Data Output 1


25 CML-O Rx4p Receiver Non-Inverted Data Output
26 GND Ground 1
27 LVTTL-O ModPrsL Module Present
28 LVTTL-O IntL Interrupt
29 VccTx +3.3 V Power Supply transmitter 2
30 Vcc1 +3.3 V Power Supply 2
31 LVTTL-I LPMode Low Power Mode
32 GND Ground 1
33 CML-I Tx3p Transmitter Non-Inverted Data Input
34 CML-I Tx3n Transmitter Inverted Data Output
35 GND Ground 1
36 CML-I Tx1p Transmitter Non-Inverted Data Input
37 CML-I Tx1n Transmitter Inverted Data Output
38 GND Ground 1


  1. Module circuit ground is isolated from module chassis ground within the module. GND is the symbol for signal and supply (power) common for QSFP modules.
  2. The connector pins are each rated for a maximum current of 500mA.

ModSelL Pin
The ModSelL is an input pin. When held low by the host, the module responds to

2-wire serial communication commands. The ModSelL allows the use of multiple QSFP


modules on a single 2-wire interface bus. When the ModSelL is “High”, the module will not respond to any 2-wire interface communication from the host. ModSelL has an internal pull-up in the module.
ResetL Pin
Reset. LPMode_Reset has an internal pull-up in the module. A low level on the ResetL pin for longer than the minimum pulse length (t_Reset_init) initiates a complete module reset, returning all user module settings to their default state. Module Reset Assert Time (t_init) starts on the rising edge after the low level on the ResetL pin is released. During the execution of a reset (t_init) the host shall disregard all status bits until the module indicates a completion of the reset interrupt. The module indicates this by posting an IntL signal with the Data_Not_Ready bit negated. Note that on power up (including hot insertion) the module will post this completion of reset interrupt without requiring a reset.
LPMode Pin
Huihongfiber QSFP28 SR4 operate in the low power mode (less than 1.5 W power consumption) This pin active high will decrease power consumption to less than 1W.
ModPrsL Pin
ModPrsL is pulled up to Vcc on the host board and grounded in the module. The ModPrsL is asserted “Low” when the module is inserted and deasserted “High” when the module is physically absent from the host connector.
IntL Pin
IntL is an output pin. When “Low”, it indicates a possible module operational fault or a status critical to the host system. The host identifies the source of the interrupt by using the 2-wire serial interface. The IntL pin is an open collector output and must be pulled up to Vcc on the host board.
Power Supply Filtering
The host board should use the power supply filtering shown in Figure 1.


Figure1. Host Board Power Supply Filtering
Optical Interface Lanes and Assignment
The optical interface port is a male MPO connector .The four fiber positions on the left as shown in Figure 2, with the key up, are used for the optical transmit signals (Channel 1 through4). The fiber positions on the right are used for the optical receive signals (Channel 4 through 1). The central four fibers are physically present.

Figure 2. Optical Receptacle and Channel Orientation
Diagnostic Monitoring Interface
Digital diagnostics monitoring function is available on all HUIHONGFIBER QSFP28 SR4. A 2-wire serial interface provides user to contact with module. The structure of the memory is shown in Figure 3. The memory space is arranged into a lower, single page, address space of 128 bytes and multiple upper address space pages. This structure


permits timely access to addresses in the lower page, such as Interrupt Flags and Monitors. Less time critical time entries, such as serial ID information and threshold settings, are available with the Page Select function. The interface address used is A0xh and is mainly used for time critical data like interrupt handling in order to enable a one-time-read for all data related to an interrupt situation. After an interrupt, IntL, has been asserted, the host can read out the flag field to determine the affected channel and type of flag.

Parameter Symbol Min. Max Unit Notes
Temperature monitor absolute error DMI_Temp -3 +3 degC Over operating temp
Supply voltage monitor absolute error DMI _VCC -0.1 0.1 V Full operating range
Channel RX power monitor absolute error DMI_RX -3 3 dB Per channel
Channel Bias current monitor DMI_Ibias -10% 10% mA Per channel

Figure 3

EEPROM Serial ID Memory Contents:

Serial ID: Data Fields (Page 00)

Address Size


Name Description of Base ID




128 1 Identifier Identifier Type of serial Module R
129 1 Ext.


Extended Identifier of Serial Module R
130 1 Connector Code for connector type R
131-138 8 Specification compliance Code for electronic compatibility or optical compatibility R
139 1 Encoding Code for serial encoding algorithm R
140 1 BR, nominal Nominal bit rate, units of 100 MBits/s R
141 1 Extended rateselect Compliance Tags for extended rate select compliance R
142 1 Length(SMF) Link length supported for SMF fiber in km (note 1) R
143 1 Length(OM3 50 um) Link length supported for EBW 50/125 um fiber (OM3), units of 2m (note 1) R


144 1 Length(OM2 50 um) Link length supported for 50/125 um fiber (OM2), units of 1m (note 1) R
145 1 Length(OM1

62.5 um)

Link length 62.5/125 um units of 1m supported for fiber (OM1), (note 1) R
146 1 Length (Copper) Link length of copper or active cable, units of 1 m (note 1)Link length supported for 50/125 um fiber (OM4), units of 2 m) when Byte 147 declares 850 nm VCSEL as defined in

Table 37

147 1 Device tech Device technology R
148-163 16 Vendor name QSFP28 vendor name(ASCII) R
164 1 Extended Module Extended Module codes for InfiniBand R
165-167 3 Vendor OUI QSFP28 vendor IEEE company ID R
168-183 16 Huihongfiber PN Part number provided by QSFP28 vendor(ASCII) R
184-185 2 Vendor rev Revision level for part number provided by vendor(ASCII) R
186-187 2 Wave length or Copper cable Attenuation Nominal laser wavelength (wavelength=value/20 in nm) or copper cable attenuation in dB at 2.5GHz (Adrs 186)and

5.0GHz (Adrs 187)

188-189 2 Wavelength tolerance Guaranteed range of laser wavelength(+/- value) from


wavelength.(wavelength Tol.=value/200 in nm)

190 1 Max case temp. Maximum case temperature in degrees C R
191 1 CC_BASE Check code for base ID fields (addresses 128-190) R
192-195 4 Options Rate Select, TX Disable, TX Fault, LOS, Warning indicators for: Temperature, VCC, RX power, TX Bias R
196-211 16 Vendor SN Serial number provided by vendor (ASCII) R
212-219 8 Date Code Vendor’s manufacturing date code R
220 1 Diagnostic



Indicates which types of diagnostic monitoring are implemented (if any) in the Module. Bit 1,0


221 1 Enhanced Options Indicates which optional enhanced features are implemented in the Module. R
222 1 Reserved


223 1 CC_EXT Check code for the Extended ID Fields

(addresses 192-222)

Vendor Specific ID Fields
224-255 32       Vendor Specific EEPROM

Mechanical Dimensions
This transceiver is specified as ESD threshold 1KV for high speed data pins and 2KV for all others    electrical      input      pins,      tested    per       MIL-STD-883,      Method 3015.4 /JESD22-A114-A (HBM).     However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.
Laser Safety
This is a Class 1 Laser Product according to IEC 60825-1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007)